JP4898829B2 - Safety belt hoisting device with force limiter controlled for belt withdrawal - Google Patents

Abstract

A seat belt retractor for motor vehicles with a vehicle-sensitive or belt webbing sensitive controllable locking device, or both, for the belt shaft, having a profiled head that acts as a support for a displaceably mounted locking member that locks the belt shaft in the housing, and a two-stage force limiting device having two force limiting elements that are switchable between a high level and a low level of force limitation via an interposed coupling (19, 20) that is controlled by means of a control device having a countergear which determines an amount of belt webbing that is extended from the belt shaft.

Description

  The invention relates to a safety belt hoisting device for a motor vehicle, which can be driven in response to a vehicle and / or in response to a belt band, a locking device for a belt shaft and a belt shaft having a housing Force limiting device comprising a profile head as a support member of a locking member movably arranged to lock the members and two force limiting members formed in two stages and connected in series in a row And a safety belt hoisting device that is switchable between a high force limit level and a low force limit level via an intervening controllable drive coupling. .

  A safety belt hoisting device having the above-described features is described in Patent Document 1 DE2001015402U1. In addition to the torsion bar arranged between the belt shaft and its profile head, this safety belt hoisting device has two other force limiting devices in the form of two sliding couplings connected in line with each other The two are connected to each other via a toothed ring with teeth on the outside and inside. A first friction coupling with a high force limiting level acts between the belt shaft or its profile head and the toothed ring and a second friction coupling between the toothed ring and the housing. The toothed ring is fixed in a stationary manner in the housing via a claw that can be driven by the control device in the initial state, and the claw is removed from engagement with the toothed ring by the control device if necessary. The toothed ring can rotate freely with respect to the belt hoist housing.

The control of the force limiting member of the known belt hoisting device is performed so that a higher force limiting level acts first in the event of an accident, since the toothed ring is fixed to the housing immobile via the pawl. If the restraining force acting on the passenger becomes too great due to the signal on the vehicle side, based on the size, weight or position of the driver, or based on the severity of the accident, the pawl will engage with the toothed ring. The toothed ring can be freely rotated with respect to the housing because it is controlled to be out of alignment. Thus, relative movement is provided between the housing and the toothed ring, and the second friction coupling located between the housing and the toothed ring acts as a force limiting device having a lower force limiting level. . Thus, each switching process takes place from a high force limit level to a low force limit level and is not reversible. In that respect, the known belt hoisting device has a high force limit level acting on a relatively small or relatively light person fixed by a belt, which increases the binding force accordingly. It is associated with the disadvantage of bringing. Only when the restraining force becomes too high is the force limit level lowered. Another disadvantage is that the known safety belt hoisting device does not allow for an instantaneous position change due to the movement of a passenger fixed on the seat.
German utility model published DE2001015402U1 European Patent Publication EP0913300A1 German Patent Publication DE 41 32 766

  The object of the present invention is to develop a safety belt hoisting device having the characteristics of the seed concept so that the adjustment of the force limit level can be made more flexibly and better adapted to the passenger situation.

  The solution to this problem, as well as the preferred forms and developments of the present invention, will become apparent from the content of the claims that precede this specification.

  In the basic idea of the invention, the control device for switching the coupling between a high force limit level and a low force limit level consists of a counter gear which determines the dimensions of the respective belt band drawers from the belt shaft, and The coupling can be reversibly switched between a high force limit level and a low force limit level in both directions.

  The present invention is associated with the advantage that the force limit level is adjusted from the beginning to a higher or lower level, respectively, according to the belt band withdrawal present at the moment of the accident. Therefore, it is possible to consider not only the belt withdrawal based on the body dimensions and the respective clothes, but also the sitting position of the vehicle occupant that is in control at the moment of the accident. That is, according to the prior art, if a low force limit level is turned on, a small, and thus usually light, passenger will be closer to the vehicle part in some cases if he leans forward just before the accident. Larger belt band withdrawal distances, combined with lower force limit levels, can already endanger passengers. On the other hand, in the safety belt hoisting device according to the present invention, it is guaranteed that the high force limit level is turned on directly through the inquiry of the belt band withdrawal even in this case. The passengers are prevented from possible forward movement while accepting a larger belt force, so that the smaller passengers are better protected.

  Furthermore, in a preferred manner, the protection for those who are constrained by a belt drawer immediately before the switching point and in which a low force limit level is on is improved. In the event of an accident, belt withdrawal occurs due to the response of a force limiting member having a low force limiting level, in which the switching point can be exceeded and thus a high force limiting level is connected.

  According to an embodiment of the present invention, the coupling is rotatably mounted in the belt hoisting device housing and is engaged by the locking member of the profile head in the locking case, and the control device has two switching positions. The toothed ring is released at one switching position by the claw and is locked by being fixed to the housing at the other switching position. Insofar as it is known from US Pat. No. 6,057,049 to use a toothed ring to implement a switching connection between two force limiting levels, the movement of the attached claw is performed only in one switching direction.

  Specifically, the force limiting member is realized with respect to the toothed ring as follows, i.e. when the toothed ring is rotatable relative to the housing, a first force limiting stage having a low force limiting level is realized and controlled. Arranged in such a way that a second force-limiting stage with a high force-limiting level is realized when the toothed ring is locked in a fixed housing by means of a pawl driven by the device to engage with the toothed ring. be able to.

  According to an embodiment of the present invention, the force limiting member that defines a low force limiting level is a torsion bar disposed outside the belt shaft in the belt hoisting device housing, and one end of the torsion bar is fixed to the housing. The other end is connected to the toothed ring via the coupling means as follows, i.e. the rotation of the toothed ring can be converted into torsion bar twist. For this purpose, a torsion bar as a second force limiting member arranged outside the belt shaft is known from patent document 2, which is directly coupled to the belt shaft via a gear transmission mechanism, and therefore Each rotates in common with the belt shaft. Since the second torsion bar is blocked when an appropriate load is applied, the force limiting action is added to the force limiting level established by the first torsion bar arranged in the belt shaft. On the contrary, in the present invention, the outer torsion bar has a rotatable toothed ring from a second force limiting member, for example in the form of a torsion bar located in the belt shaft as well. Separated.

  According to an embodiment of the present invention, the coupling means comprises a metal band having a predetermined length, one end of which is suspended on a toothed ring, and the other end is a torsion bar. It is wound on a take-up roll rotatably connected to a belt hoisting device housing, which is coupled so as not to rotate relative to it, and is fixed to it on the end side. From there, the advantage is that the belt band drawer combined with the twist of the torsion bar is limited to the length of the metal band to be pulled out, even when the force limit level is low. When the metal band is fully withdrawn, there is a direct force transmission from the toothed ring to the twisted torsion bar and thus into the housing, so that a rigid system is formed, in which the claw Even if the toothed ring is rotatable by itself, the high force limiting level of the other force limiting members is nevertheless effective. Thus, additional safety is also provided for those whose control device provides only a low force limit level.

  In an alternative embodiment, with respect to the formation of a force limiting member that defines a low force limiting level, the force limiting member that defines the low force limiting level is disposed in a fixed housing, disposed on the belt hoist housing outside the belt shaft. A bending brake having a tension member guided through the chicane, wherein one end of the tension member is on the toothed ring as follows, i.e., the rotation of the toothed ring causes the tension member to pass through the chicane, It is connected so that it can be converted into a drawer that absorbs energy. An associated advantage is that the placement of a bending brake as an additional force limiting member is cost-effective. The effectiveness of the force limit can be adjusted in a simple manner via the length of the pull member to be pulled through the chicane and hence the stock to be delivered.

  According to various embodiments of the present invention, the free end of the tension member is arranged to extend around the outside of the toothed ring forming the stock, or the free end of the tension member forming the stock is a belt It can be disposed in a stock housing that is rotatably mounted on the hoist housing and can be withdrawn from the stock housing.

  Preferably, the force transition during the force limit is such that the tension member has a width that does not change over its length, or that the tension member has a different width over its length according to the desired change in force limit level. It can be adjusted by selecting the width of the tension member.

  According to the embodiment of the present invention, the counter gear is mounted on the housing in such a manner that the external gear connected to the belt shaft, the other external gear arranged to be fixed to the housing, and the two switching positions can be swung. A switching protrusion which is arranged on the oscillating arm and which has a third external gear, all three gears mesh with each other, and a switching point for each oscillating arm is defined on the gear. The switching protrusions are in contact with each other in a predetermined pulled-out state, and thereby swing between the switching positions by the swing arm. This type of counter gear is known from Patent Document 3 in principle as a retractor switch for using a safety belt hoisting device, especially in a child seat. The counter gear turns off a control system that reacts to a belt band for locking the belt shaft or reacts to the vehicle when the retractor is used with a child seat. In this known counter gear, two gears having switching protrusions are arranged on the swing arm, and the gears respectively mesh with gears coupled to the belt shaft. Based on the arrangement of the switching projections on the individual gears, the belt band must first be pulled out of the belt shaft once before bringing the switching process, so that the belt band can be adjusted to use the child seat. When returning to the position, the corresponding vehicle-side control system is turned off. Thereafter, returning the belt band further to the removal position results in a new switchover that turns on a control system that is responsive to the belt band and responsive to the vehicle.

  In the present invention, it is important to accurately determine the switching point for inserting the claw into the toothed ring in accordance with the belt band pull-out movement and also the belt band winding movement. According to an embodiment, in order to limit the switching hysteresis, the gear coupled to the belt shaft and the gear supported on the housing each have one switching projection and two gears supported on the swing arm. There are two switching protrusions. Accordingly, each of the two switching protrusions arranged on the gear supported on the swing arm cooperates with the switching protrusion of the gear fixed to the shaft or the switching protrusion of the gear supported on the housing. The two switching points can be adjusted via a very small rotation angle.

  As long as the swing arm controlled by the counter gear has to drive the pawl in its two switching positions, according to an alternative embodiment of the present invention, the swing arm has a mechanical connection with the pawl. Directly or through an intervening electronic or fluid switch.

  In the case of direct mechanical drive, according to an embodiment of the present invention, the claw is arranged with a control claw movable with respect to the claw and cooperating with the swinging arm. It has control teeth that cooperate with the external teeth of the ring. This type of configuration ensures that the pawl is engaged with a precise fit into the outer teeth of the rotating toothed ring via the engagement of the control pawl and does not result in tooth-upper-tooth locking. . This is also true for the switching process between belt withdrawals that occurs during the wearing process or when the wearer moves. This also applies to the switching of the force limit level when switching is effected by the insertion of a claw into the outer teeth of the ring.

  Here, according to an embodiment of the present invention, the claw is provided with a slit-shaped bearing recess for a control claw formed in a U shape, the coupling leg of which is inserted into the bearing recess with play. Can have. With respect to the reversible formation of the coupling, the pawl can be biased to the release position for the toothed ring using a spring with respect to the return of the pawl.

  In an embodiment of the invention, the control pawl is energized by a biased spring in a direction to fit into the external teeth of the toothed ring, and the biased spring is toothed using a separately switchable holding device. It is fixed in a position to release the control pawl for the ring, and its holding device releases the biased spring when the control pawl is inserted into the external teeth of the toothed ring. The associated advantage is that when the control pawl is dynamically inserted into the external teeth of the toothed ring, the switching force of the control pawl is increased by the release of the biased spring at the start of the rotation of the toothed ring. That is. On the one hand, the high force limit turned on by the locking of the toothed ring, based on the increase of the switching force and the fitting input in which the control claw is then inserted into the external teeth of the toothed ring. The level is no longer possible, on the other hand, the control pawl additionally acts as a detent against the inadvertent rotation of the toothed ring based on its spring bias.

  In particular, the holding device can consist of a link that moves between a holding position and a release position with respect to the biased spring. For this purpose, according to an embodiment of the invention, the link is held in a holding position by a holding lever, which holding lever is supported in a complementary shape in a recess formed in the toothed ring, When rotated, it becomes free from the toothed ring. By coupling the holding device to the rotation of the toothed ring, it is ensured that no malfunction or switching occurs. This is because the release of the holding device is only brought about by the toothed ring starting to rotate, and the toothed ring is secured by a load-absorbing claw which becomes directly effective.

  In accordance with an embodiment of the present invention, the biased spring extends through the control pawl rotary bearing at the pawl in the following manner, i.e., the force line of spring force is in the control pawl release position for the toothed ring. When the control claw swings, it is energized as long as it is arranged and oriented so as to generate torque in the direction in which the control claw is inserted into the toothed ring based on its bending. Combined with the advantage that no additional torque acts in the non-actuated position of the spring, which must be absorbed by the holding device. Only when the control claw swings will the intended torque be as effective as desired.

  Embodiments of the invention are illustrated in the drawings and are described in detail below.

  A safety belt hoisting device 10 shown in FIGS. 1 and 2 has a U-shaped housing 11 having side housing legs 12, and a belt shaft 13 is supported in the housing legs 12. Reference numeral 14 denotes a so-called spring side of the belt shaft, on which a spring housing for winding up the belt shaft, not shown, and other functional members such as a tightening device are arranged. can do. Reference numeral 15 denotes an end portion of a torsion bar disposed in the belt shaft 13, and the torsion bar forms a force limiting member having a high force limiting level.

  In any case, a second force limiting member having a lower force limit level than that of the torsion bar 15 is provided in the form of a second torsion bar 16 disposed outside the belt shaft 13. One end of the bar is fixed in a corresponding housing leg 12 of the belt winder housing 11, and the other end is a take-up roll rotatably supported by the opposite housing leg 12. 17 is connected to the non-rotatable portion. A metal band 18 is wound on the take-up roll 17 and its free end is attached to a toothed ring 19 that is rotatably supported on the corresponding housing leg 12. As can be seen from the other figures, the toothed ring 19 has external teeth that cooperate with the external teeth and the pawls 20 that are journaled to transmit force into the housing legs 12.

  As can be seen from FIG. 2, a bearing plate 28 is arranged outside the housing leg 12 bearing the toothed ring 19, which bearing plate 28 has a counter gear 22, which comprises a gear 23, a gear 24, , A gear 25 which is coupled to a corresponding end of the belt shaft 13, a gear 24 is supported on a bearing plate 28, and a gear 25 is supported on a bearing plate 28 so as to be swingable. 21 is arranged. The protrusion of the swing arm 21 extends under the bearing plate 28 and interacts with the claw 20 as will be described later.

  In FIG. 3, the individual parts already described above of the safety belt hoisting device 10 are shown again in detail, and it is clear that the end of the profile shaft 26 that fits into the bearing plate 28 of the belt shaft 13. And a torsion bar 15 extending in the belt shaft 13 and coupled to the torsion bar 15 so as not to rotate relative thereto. The profile head 26 is provided with a swinging claw 27 for inertia control. The swinging claw 27 can be engaged into the internal teeth 33 formed on the toothed ring 19. On the other hand, the claw 20 is formed so as to be engaged into the external teeth 34 of the toothed ring 19.

  Furthermore, as can be seen from FIGS. 4 and 5 with an enlarged representation of the counter gear 22, the gears 23, 24, 25 are as follows with respect to each other, ie the gear 25, which is supported on the swing arm 21. Are arranged such that at each of the two possible switching positions of the oscillating arm 21, it meshes with the shaft gear 23 on the one hand and with the gear 24 supported on the bearing plate 28 on the other hand. Switching protrusions 30 to 31 are formed on the two gears 23 and 24, respectively. On the other hand, the gear 25 supported on the swing arm 21 is provided with two switching projections 32a and 32b whose rotational angles are shifted from each other. The switching projection 32a is a predetermined gear of the counter gear 22. In position, it contacts the switching protrusion 30 of the gear 23 (FIG. 5), and the switching protrusion 32b contacts the switching protrusion 31 of the gear 24 supported by the bearing plate when the swing arm 21 is in another position. As is clear from the comparison between FIG. 4 and FIG. 5, when two switching projection combinations are generated, the swing arm 21 is swung according to the two switching positions. Based on the two switching protrusions 32a and 32b provided on the gear 25 arranged on the swing arm 21, the respective switching points can be determined with a slight rotation angle interval. As a result, the drawing direction and the winding direction can be determined. Not only is a precise repeatable switching point in the direction formed, but the two switching points are also located very close to each other with respect to the rotation angle of the belt shaft 13.

  As far as it can be seen in detail from FIG. 6 that the toothed ring 19 cooperates with the outer torsion bar 16 via the metal band 18, the pawl 20, which is mounted in the housing leg 12, is connected to the toothed ring 19. Engaging within the outer teeth 34 of the present invention is understood in detail in FIGS. In order to ensure that the claw 20 engages in the external teeth 34 of the toothed ring 19 even when the toothed ring 19 rotates, a separate control claw 29 is provided. It is formed as a U-shaped component having a side leg 36 and a coupling portion 37 positioned therebetween, and the claw 20 has a slit-shaped bearing notch 38, and the bearing notch 38. Since the coupling portion 37 of the control claw 29 is inserted into the claw 20, the claw 20 is sandwiched between the legs 36 on the side of the control claw 29. As long as this is the case, the control claw 29 itself is rotatably supported by the claw 20 with play of movement. In this bearing, a tilt edge 39 that protrudes slightly is formed at the coupling portion 37 of the control claw 29, and the tilt edge 39 is inside an accommodation groove 40 formed at the bottom of the slit-shaped bearing notch 38 of the claw 20. Thus, the control claw 29 can be moved within the claw 20 with a slight power consumption. Control teeth 42 are formed in the coupling portion 37, and the control teeth are formed so as to mesh with the external teeth 34 of the toothed ring 19. A leaf spring 35 is engaged with the claw 20, and the leaf spring 35 holds the claw in a non-actuated position where the engagement with the external teeth 34 of the toothed ring 33 is released.

Figures 10a-10c reveal a form of bi-directional switching between two force limit levels.
First, as is apparent from FIG. 10a, the pawl 20 does not mesh with the external teeth 34 of the toothed ring 19; the same applies to the control pawl 29, which acts on the swing arm 21 acting on it. Is held at the position shown in FIG. At this position, the swinging claw 27 supported by the profile head 26 is not meshed with the internal teeth 33 of the toothed ring 19. Thus, at this position of the components involved in each other, the belt shaft 13 can rotate freely. However, when the swinging claw 27 is triggered to mesh with the internal teeth of the toothed ring 19, the toothed ring 19 rotates in the belt pulling direction together with the belt shaft, and the toothed ring 19 is suspended by it. Since energy is supplied to the outer torsion bar 16 through the formed metal band 19, a low force limiting member becomes effective when the belt shaft further rotates.

  FIG. 10 b shows the position of the control claw 29 when the swing arm 21 is switched by the counter gear 22, and the protrusion 41 of the swing arm 21 is the external tooth 34 of the toothed ring 19. Therefore, when the toothed ring 19 starts to rotate, the control claw 29 is captured and swung, and the claw 20 is swung similarly by the swing of the control claw. The outer teeth of the attached ring 19 are meshed as determined, and when meshed, they are interlocked accordingly.

  However, in the functional position shown in FIG. 10b, the rocking claw 27 is still not engaged with the inner teeth 33 of the toothed ring 19, so the position shown in FIG. This position only shows the switching position where the toothed ring 19 is fixed to transmit force directly to the housing leg 12 or the housing 11 via the claw 20 when the swing claw 27 is triggered. In the second torsion bar with a low force limit level, located outside the belt shaft, is not effective. Rather, when the claw 20 is fitted into the external tooth 34 of the toothed ring 19, only the torsion bar 15 having a high force limit level arranged in the belt shaft 13 is connected. This condition is shown in FIG. 10c in a predetermined intermediate position before the pawl 20 is fully engaged into the external teeth 34 of the toothed ring 19, so that the pawl 20 is “ready to join”. "

  In the embodiment shown in FIGS. 11 a-11 c, the arrangement of the biased spring 50 that biases the control claw 29 in a direction to engage the external teeth 34 of the toothed ring 19 causes the control claw 29 to move the toothed ring 19. An additional switching force or torque is produced when engaged in the teeth. For this purpose, the end of the control claw 29 is supplied with energy by a biased spring 50, which is supported by a spring bearing base 51 attached to the belt hoisting device housing 11. The biased spring 50 extends with respect to the control claw 29 via a rotary bearing 56 of the control claw 29 provided on the claw 20 in a position where the spring force line releases the control claw 29 for the toothed ring 19. In this inoperative position of the control pawl 29, the biased spring 50 does not provide an additional moment that must be absorbed by the associated holding device. This holding device comprises a link 52 which is slidably guided in contact with a spring bearing base 51, and the link fixes a biased spring 50 in an initial position shown in FIG. 11a. The link 52 itself cooperates with a holding lever 53 that is rotatably supported around a rotation point 54, and the holding arm of the holding lever is supported in a complementary shape in a recess 55 formed in the toothed ring 19. ing. Therefore, in the position shown in FIG. 11 a, the control claw 29 is held at a position where it does not mesh with the external teeth 34 of the toothed ring 19.

  When the toothed ring 19 starts to rotate when the need arises, the rotation of the toothed ring 19 frees the holding lever 53 from the recess 55 of the toothed ring 19, thereby swinging and linking. 52 slides within the spring bearing base 51 and the biased spring 50 is released, thus supplying energy to the control pawl 29. This functional position is shown in FIG. 11b.

  Based on the position of the counter gear 22 according to the explanation given for FIG. 10b, when the control claw 29 is inserted into the movement path of the external tooth 34 of the toothed ring 19 and the toothed ring 19 starts to rotate. When captured and swung, this insertion movement of the control claw 29 introduced by the swinging of the control claw 29 bends and thereby energizes, adding additional torque to the control claw 29. Supported by a spring 50. In this way, the control claw is also subjected to the action of the biased spring 50 and is held in mesh with the external teeth of the toothed ring, so that the switching process is performed irreversibly and at the same time thereby the control claw 29 Acts as a detent for the toothed ring 19.

  12 and 13, the coupling of the torsion bar 16 and the toothed ring 19, which are arranged outside the belt shaft 13 and have a low force limit level, via the metal band 18 is revealed again. As shown in FIG. 12, when the toothed ring 19 rotates, the metal band 18 is pulled out from the take-up roll 17, and the take-up roll is connected to the torsion bar 16 so as not to be relatively rotatable. Twist this torsion bar while absorbing force. As shown in FIG. 13, when the metal band 18 is completely pulled out from the winding roll 17, the metal band 18 can be rotated based on being fixed so as to transmit a force to the torsion bar 16. A robust system for force transmission through the toothed ring 19 is formed.

  As long as FIGS. 14 and 15 show another embodiment for arranging a force limiting member having a low force limiting level, the function of the self-locking belt hoisting device is performed as described above. In the embodiment shown in FIGS. 14 and 15, an additional torsion bar with a small force limit level is simply replaced by a bending brake. This bending brake consists of a tensioning member 60, preferably in the form of a metal band made of a suitable material, which is suspended on a toothed ring 19 at one end and arranged in a fixed housing. Guided through 61. Projecting beyond the chicane 61 is a free end 62 of the pull member that forms a stock for pulling the pull member 60 through the chicane 61. In the embodiment shown in FIG. 14, the free end 62 of the pulling member 60 is wound around the outside of the rotatable toothed ring 19 following the chicane 61 and is thus provided as stock. In the embodiment shown in FIG. 15, this free end 62 is inserted into a separate stock housing 63, which is rotatably arranged in the belt hoist housing 11, and when the toothed ring 19 rotates. It can be drawn from there.

  Next, the function of the belt hoisting device according to the present invention will be described again with reference to the above description of the function of the individual components.

  When the occupant wears a belt band (not shown) wound on the belt shaft 13 of the safety belt hoisting device 10, the dimensions of the belt withdrawal are recorded by the counter gear 22, and the appropriate rotation speed of the belt shaft is recorded. Later, when the switching projection 30 on the shaft gear 23 abuts on the switching projection 32a of the gear 25 supported on the switching swing arm 21 and reaches this switching point, the swing arm 21 is shown in FIG. Switch to the position shown. That is, reaching this switching position when pulling out the belt means that a large occupant who needs so many belt bands has been restrained. For large passengers of this kind, only a large force limit level is effective in the event of an accident, so that when the specified switching point is reached, the control claw 29 will cause the external teeth 34 of the toothed ring 19 to Move into the rotation route. When the belt shaft 13 and the toothed ring 19 are coupled by engaging the swinging claw 27 supported by the profile head 26 into the inner tooth 33 of the toothed ring 19 in the event of an accident, the toothed ring 19 operates the control claw 29, and the control claw accordingly meshes the claw 20 into the external teeth 34 of the toothed ring 19, so that the toothed ring 19 is fixed to the housing 11. In this position, the second torsion bar 16 or the tension member 60 having a low force limit level cannot be activated. As long as the embodiment shown in FIGS. 11 a-11 c is implemented, the biased spring 50 assists the control pawl 29 having the pawl 20 to mesh dynamically into the external teeth 34 of the toothed ring 19. .

  On the other hand, when a relatively small occupant wears a safety belt, the mentioned switching point between the switching protrusions 30 and 32a is not achieved by the belt withdrawal accordingly, so that the swing arm 21 is As shown in FIG. 10 a, the control claw 29 remains in a position where it does not mesh with the external teeth 34 of the toothed ring 19. In this position, the toothed ring 19 rotates with respect to the housing when the swinging claw 27 is triggered and engaged with the inner teeth 33 of the toothed ring 19 in the event of an accident and is coupled to the belt shaft 13. The metal band 18 can be withdrawn from the take-up roll 17; the rotation of the take-up roll 17 causes a twist that absorbs the force of the torsion bar 16. Since the force limit level of the torsion bar 16 is designed to be lower than the force limit level of the torsion bar 15 of the belt shaft 13, it is suitable for a relatively small passenger in the rotatable toothed ring 19, And it provides only a small force limit level provided. The same applies to the arrangement of the pulling member 60 as a force limiting member.

  If the occupant needs a belt band that is long enough that the proper switching point of the counter gear 22 has not yet been achieved in the mounting process, he first remains in the position described above with respect to FIG. 10a. However, when the occupant thus mounted moves and bends forward, for example, many belts are pulled out, and the belt drawer is adjusted appropriately between the switching protrusion 30 and the switching protrusion 32a. As long as the switching point is exceeded, the oscillating arm 21 is also switched for this state, which is only for a short time in some cases, so that a switching ready state is brought about for switching only the torsion bar 15. In this type of case, when the occupant wakes up again, the switching protrusion 32b of the gear 25 arranged on the swing arm 21 is brought into contact with the bearing plate 28 by the belt retraction associated with the reverse rotation of the belt shaft 13. Position where the swinging arm 21 abuts on the switching protrusion 31 of the arranged gear 24 so that the swinging arm 21 newly holds the control claw 29 so as not to mesh with the toothed ring 19 as shown in FIG. So that the toothed ring can rotate freely again. This bi-directional switching is not perceived by the occupant who is wearing it, but depending on the sitting position that controls at the moment of the accident, even with a relatively small occupant, a low force limit level or a high force limit from the beginning The level is turned on to ensure that the passenger is prevented from moving too far forward in the latter case.

  However, a similar switching condition can also occur if the belt withdrawal associated with enabling the second torsion bar 16 in the event of an accident results in an excess of the switching point, initially with a small force. Passengers who have received the restriction level may approach the vehicle part unacceptably in some cases. Even in such a case, especially based on the formation of the control claw 29, the claw 20 is engaged into the rotating toothed ring 19, and the high force limit level shown in FIG. 10c is turned on.

  The features of the subject matter of this document disclosed in the above description, the claims, the abstract and the drawings, whether alone or in any combination with each other, may be essential for implementing the invention in various embodiments. it can.

It is a perspective view which shows a belt winding apparatus. It is a perspective view which shows the object of FIG. 1 from another viewpoint. It is a perspective view which decomposes | disassembles and shows the object shown to FIG. It is a top view which shows the control apparatus formed as the counter gear in one switching position of the swing arm. The object of FIG. 4 is shown at the other switching position of the swing arm. The toothed ring and its connected torsion bar with a low force limit level are shown in exploded view. It is the partial display which expands and shows a nail | claw with the control claw and toothed ring which were matched. It is a perspective view which shows a nail | claw and the control nail | claw attached to it. The object of FIG. 8 is displayed separately for the nail and the control nail. The sequence which a nail | claw inserts in the external tooth of a toothed ring is shown. The sequence which a nail | claw inserts in the external tooth of a toothed ring is shown. The sequence which a nail | claw inserts in the external tooth of a toothed ring is shown. The control pawl is shown in a functional position with the control pawl, with a biased spring and an associated holding device for the biased spring that energize it. The control pawl is shown in a functional position with the control pawl, with a biased spring and an associated holding device for the biased spring that energize it. The control pawl is shown in a functional position with the control pawl, with a biased spring and an associated holding device for the biased spring that energize it. It is a side view which shows a toothed ring and the torsion bar which has a low force restriction level connected to it in an initial state. The object of FIG. 12 is shown with the metal band pulled out. FIG. 6 is a side view showing a toothed ring with a force limiting device having a low force limiting level formed as a bending brake. The object of FIG. 14 is shown in another embodiment.

Claims (22)

A safety belt hoisting device for automobiles,
A locking device for the belt shaft which can be controlled in response to the vehicle or in response to the belt band;
A profile head as a support for a locking member movably disposed to lock a belt shaft having a housing;
A two-stage force limiting device having two force limiting members connected to enable continuous operation ;
In a safety belt hoisting device, wherein the force limiting member is switchable between a high force limiting level and a low force limiting level via an intervening coupling that can be controlled using a control device,
A control device for switching the coupling (19, 20) between a high force limit level and a low force limit level comprises a counter gear (22) that defines the dimensions of the respective belt drawer from the belt shaft (13). And the coupling (19, 20) can be reversibly switched between a high force limit level and a low force limit level in both directions.
A safety belt hoisting device for automobiles. A toothed ring (19) rotatably coupled to the housing (11) of the belt hoisting device (10), the coupling being engaged by a locking member (27) of the profile head (26) when locking, and a control device Comprising a claw (20) movable in both directions between two switching positions according to (22),
Using the pawl, the toothed ring (19) is released in one switching position and locked in a housing fixation in the other switching position.
The safety belt hoisting device according to claim 1. The force limiting member (15, 16) is related to the toothed ring (19)
When the toothed ring (19) is rotatable relative to the housing (11), a first force limiting stage having a low force limiting level is realized,
A second having a high force limiting level when the toothed ring (19) is fixedly secured to the housing by means of a pawl (20) that can be driven by the control device (22) to engage the toothed ring (19). Arranged so that the force limiting stage is realized,
The safety belt hoisting device according to claim 1, wherein the safety belt hoisting device is provided. A force limiting member defining a low force limiting level is a torsion bar (16) arranged outside the belt shaft (13) in the belt hoist housing (11),
One end is clamped by the housing,
The other end is connected to the toothed ring (19) via the coupling means (18) so that the rotation of the toothed ring (19) can be converted into torsion of the torsion bar (16). ,
The safety belt hoisting device according to claim 2, wherein the safety belt hoisting device is provided. The coupling means comprises a metal band (18) having a predetermined length;
One end of the metal band is suspended on a toothed ring (19) and the other end is rotatable to a belt hoist housing which is connected to the torsion bar (16) in a non-rotatable manner. Is wound on a winding roll (17) disposed on the rear end and is fixed to the winding roll on the terminal end side,
The safety belt hoisting device according to claim 4. A tensioning member (60) guided through a chicane (61) arranged in a fixed housing, arranged on the belt winder housing (11) outside the belt shaft (13), a force limiting member defining a low force limiting level. ) Bending brake having
One end of the pull member can be converted to a toothed ring (19) and rotation of the toothed ring (19) can be converted to a pull that absorbs the energy of the pull member (60) through the chicane (61). ,It is connected,
The safety belt hoisting device according to claim 2, wherein the safety belt hoisting device is provided.   7. Safety according to claim 6, characterized in that the free end (62) forming the stock of the tension member (60) is arranged extending around the outside of the toothed ring (19). Belt hoisting device.   The free end (62) forming the stock of the pulling member (60) is disposed in a stock housing (63) rotatably mounted on the belt winder housing (11), so that the stock housing (63) The safety belt hoisting device according to claim 6, wherein the safety belt hoisting device can be pulled out from the belt.   9. A safety belt hoisting device according to any one of claims 6 to 8, characterized in that the tension member (60) has a width that does not change over its length.   9. A safety belt hoisting device according to any one of claims 6 to 8, characterized in that the tension member (60) has different widths over its length according to the desired change in the force limit level. . The counter gear (22) can swing to two switching positions, an external gear (23) coupled to the belt shaft (13) and another external gear (24) arranged fixed to the housing. And a third external gear (25) disposed on a swing arm (21) supported by the housing,
The switching protrusions (30, 31, 32a, b) which mesh with each other and define switching points for the swinging arm (21) on the gears (23, 24, 25), respectively. ) Is placed,
The switching protrusions abut against each other in a predetermined drawn-out state, thereby swinging the swing arm (21) between switching positions;
The safety belt hoisting device according to any one of claims 1 to 10, wherein the safety belt hoisting device is provided. To limit the switching hysteresis,
The gear (23) coupled to the belt shaft (13) and the gear (24) supported by the housing each have one switching protrusion (30, 31) and are supported on the swing arm (21). The gear (25) has two switching protrusions (32a, b);
The safety belt hoisting device according to claim 11.   13. The safety belt hoisting device according to claim 11 or 12, characterized in that the swing arm (21) directly drives the pawl (20) via a mechanical connection.   13. The safety belt hoisting device according to claim 11, wherein the swing arm (21) indirectly drives the pawl (20) via an intervening electronic switch.   13. The safety belt hoisting device according to claim 11 or 12, wherein the swing arm (21) indirectly drives the pawl (20) via an intervening fluid switch.   The claw (20) is arranged with a control claw (29) movable relative thereto and cooperating with the swing arm (21), said control claw being external teeth (34) of the toothed ring (19). 14. A safety belt hoisting device according to any one of the preceding claims, characterized in that it has control teeth (42) cooperating with.   A claw (20) is a slit-shaped bearing recess (38) for a control claw (29) formed in a U-shape, whose coupling web (37) fits into the bearing recess (38) with play. The safety belt hoisting device according to claim 16, further comprising:   18. A safety belt hoisting device according to claim 16 or 17, characterized in that the pawl (20) is biased by a spring (35) to a release position for the toothed ring (19). The control pawl (29) is energized by the biased spring (50) in a direction to mesh into the external teeth (34) of the toothed ring (19);
The biased spring (50) is fixed in a position to release the control pawl (29) for the toothed ring (19) by means of a separately switchable holding device (52, 53),
The holding device releases the biased spring (50) when the control pawl (29) is fitted into the external teeth (34) of the toothed ring (19).
The safety belt hoisting device according to any one of claims 15 to 18, wherein the safety belt hoisting device is provided.   20. Safety belt hoisting device according to claim 19, characterized in that the holding device consists of a link (52) movable between a holding position and a release position with respect to a biased spring (50).   The link (52) is held in the holding position by the holding lever (53), and the holding lever is supported in a complementary shape in a recess (55) formed in the toothed ring (19), and the toothed ring 21. Safety belt hoisting device according to claim 20, characterized in that it is freed from the toothed ring (19) when it rotates. The biased spring (50) is as follows:
It is arranged such that the line of force of the spring force in the release position of the control claw (29) for the toothed ring (19) extends through the rotary bearing (56) of the control claw (29) in the claw (20). And oriented,
When the control claw (29) swings, torque is generated in the direction in which the control claw (29) fits into the toothed ring (19) based on the bending of the control claw (29).
The safety belt hoisting device according to any one of claims 19 to 21, wherein the safety belt hoisting device is provided.

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